Nut lock



Patented June 22 1926.

UNITED STATES BERTRAM BOACH,

OF DAYTON, OHIO.

1m LOCK.

Application filed March 29, 1926. Serial No. 98,128.

This invention relates to nut locks. The object of the invention is to provide means whereby nuts can be positively held I against rotation. The invention consists in I providing a nut with a'plurality of grooves, the bottoms of which are tapered from the outer edge toward the peripheral center to form cam surfaces and a second nut having a series of grooves radiating from the 'center thereof, a spring washer being interposed between said nuts, said washer havmg at one end a lug provided with a cam surface to co-ac't with the cam surfaces in one nut and another lug at its other end to enter the grooves in the other nut, the first mentioned lug also being adapted to enter a groove in the usual threaded bolt, all as hereinafter described.

In the accompanying drawings: v Figure 1 is a planview of my improved nut lock in clamping position.

Figure 2 is a detail assembly sectional view of the device.

Figure 3 is a perspective view of the-several elements in position for assembly.

Figure 4 is a p of one nut. Figure 5 washer.

Figure 6 is a plan view of the inner face of the other nut.

Referrin bolt 1 of t e usual approved form and dimensions, one end of said bolt being thread- 85 ed as indicated at 2, and having a oo've 3. A nut 4, which may be termed t e positioning nut, has a plurality of grooves in one face whose bottoms are tapered from the outer edge of the nut toward the peripheral center thereof to form cam. surfaces 5. A second nut 6 which I will term the tightening nut, has a series of grooves 7 in one face radiating from the center thereof. A spring washer 8 has at its ends is an elevation of the spring lugs 9 and 10, extending at right angles thereto and in opposite directions. The

9 is bevelled on its end and adapted. to suecessively engage with the grooves 7 in the nut 6 when the latter is' applied to the bolt for holding the parts in locked position.

The lug 10 is t spared to form an inclined cam surfaee, own at 11, ada ted to co- --act with si ly! one of the incline cam surfaces 5. 0 lug 10 is also extended-in- I BI wardly of the inner periphery of the washan view of the inner face to the drawings I provide aer, as shown at 12, and shaped to enterthegroove 3 in the bolt 1.

In operation the nut 4 is positioned on the bolt 1 with one of the grooves 5 in line with the groove 3. The washer 8 is then placed on the bolt with the portion 12 of the lug 10 in the groove 3 in the bolt, after which the nut 6 is placed on the bolt and as it is tightened against the washer 8 the co-acting cam surfaces 5 and 11 will cause not only a tightening of the Washer 8 and nut 4 but also a further wedging of the lug 10 into the groove in the bolt 1, thereby effooting-a locking of the several parts which is highly efficient. It will further be noted that my improved nut lock is inexpensive and eas to assemble and disassemble.

v It wil be understood that I desire to comprehend within my inventionsuch modifi: cations as maybe necessary to adapt it to varying conditions and uses.

Having thus fully described my-inven- 7 tion what I claim as new and desire to secure by Letters Patent, is v 1. In a nut lock, the combination with a spring washer having at its ends lugs opositely disposed, one of said lugs being.

arger than the other and havin a. tapere ortion forming a cam surface, 0 a nut hav- 1ng radiating grooves in one face thereof, the smaller of said lugs being adapted to be seated in any one of said grooves, and a second nut having in one face a plurality of grooves with tapered bottoms forming cam surfaces adapted to co-act with the cam surface on the larger lug. v

2. In a nut lock, he combination with a bolt, having a. groove, of a nut adapted to be placedon said bolt and having in one face a plurality of grooves with ta red bottoms forming cam surfaces, asecon nut on said bolt having radiating grooves in one face, a spring washer surrounding said bolt and interposed between said nuts, and lugs on the ends of said washer adapted to be respectivelyseated within the grooves of ion 

